When you play with your dog or cuddle/snuggle they do such cute random things. This is a great chance capture behavior; have a clicker on a finger band or wrist strap with canned cheese nearby. Can cheese is inaccessible/unattractive to the dog and doesn't spoil so it's easy. Think of those cute paws to your hand (click/cheese) that could be the beginning of a shake or targeting. A roll on side, that belly up for a scratch. Sometimes the time you're just watching can be a great chance. This is how I taught a dramatic dead/bang. I was petting my dog in the car waiting for my hubby and she just sighed and flopped over whap on the bed. Since I had a clicker there I click/treated. Accidents are sometimes very fun.